JP3249311B2 - Tire uniformity test equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tire uniformity test apparatus, for example, a uniformity test for automobile tires, light truck tires, light truck tires, motorcycle tires, and truck / bus tires. It concerns the device.

[0002]

2. Description of the Related Art For example, a uniformity testing apparatus for tires for passenger cars, light trucks, light trucks, motorcycles, and trucks and buses is a tire to be measured as shown in FIG. A rotating shaft for mounting the vehicle, a rotating drum parallel to the rotating shaft and having a flat surface, a tire capable of pressing the drum against the tire (or the tire against the drum) to maintain a constant distance between both shafts The measuring unit 1 includes a load device (not shown) and a device (not shown) for measuring force components in three axial directions generated when the tire rotates. The operation and measurement in this conventional test apparatus are executed based on a predetermined sequence. Hereinafter, referring to FIG. 9 showing the sequence flow, steps S1, S1
The description will be made in the order of 2,. The test apparatus fetches set values (symbols △, 等, etc. in FIG. 9) relating to various operations and measurements, operates the various apparatuses according to the settings, and performs measurement as follows. First, a tire is mounted on the rim for measurement and filled with air (S1). Next, running (warming up) is performed by applying a predetermined load to the tire (S2 to S6).
Next, the air pressure and the number of rotations of the tire are adjusted (S6). Next, the distance between the tire shaft and the drum shaft is kept constant (the load is adjusted) (S6). Next, the force generated by rotating the tire, its fluctuation, and the fluctuation of the geometrical shape are read (S
7 to S11). Here, the uniformity refers to a force generated during a single rotation of a tire under a load with a constant radius, a magnitude of the variation, and a variation in a geometric shape. The generated force and its fluctuation are shown in FIG.
(B) Component RFV (radial direction), LF in three axial directions shown in FIG.
V (horizontal direction), TFV (front-back direction), LFD, and conicity, and the variation of the geometrical shape is shown in FIGS.
RRO: radial runout (variation in geometric shape in the radial direction) shown in FIG. 4, LRO: lateral runout (variation in geometric shape in the width direction) shown in FIGS. 4A and 4B, and bumpy. RFV, LFV, and TFV are represented by the magnitude of the force fluctuation in each measurement direction. LFD is an average value of the lateral force in one rotation of the tire, and a lateral force that is constantly generated irrespective of the rotation direction of the tire in the LFD is called conicity. RRO is represented by the magnitude of variation in the radial length of the tire (displacement in the outer diameter), which is calculated from the reference point when the tire makes one revolution as shown in FIG. Obtained by variations in distance to the surface. The waveform diagram is shown in FIG. LRO is represented by the magnitude of the variation in the length in the lateral direction of the tire (displacement of the width), which is, as shown in FIG. Obtained by the variation of the distance to Usually, two reference points are taken, and the upper part of the tire (front of the tire) and the lower part (back of the tire) are measured. An example of the waveform is shown in FIG. In addition, there is bumpy, a variation in geometric shape. This is the size of the local unevenness in the tire sidewall portion, and is measured by the same method as the lateral runout measurement (see FIG. 4A). However, while the lateral runout measurement measures the magnitude of variation per tire revolution, the bumpy measurement measures the local (tire 15 °)
The size of a noticeable unevenness (fluctuation in distance) such as width, 20 ° width, etc. is measured. Thereafter, classification of the total rank and classification of the individual rank are performed (S12). here,
Classification of total and individual ranks will be described. The uniformity test apparatus can perform individual rank classification for each measurement item by comparing the measurement result with a preset threshold value. For example, as shown in FIG. 5, the setting of the threshold value of RFV is as follows: A rank = 10, B rank = 20,
The individual rank for each measurement result when C rank = 30 is set as follows. Measurement result RFV = 8 ... A rank Measurement result RFV = 12 ... B rank Measurement result RFV = 25 ... C rank Then, the total rank is classified by the combination of the individual rank results classified for each measurement item. For example, if RFV = A AND LFV = A, classification of the total rank is performed by a combination of ranks for each measurement item, such as total A rank. In addition, similarly to the total rank, the processing determination of the grinder is also performed by a combination of ranks for each measurement item. For example, if RFV = B AND LFV = C, the grinder is executed. Grinder processing is RFV or R
Depending on the magnitude of the FV primary component (1 Hz signal component), R
Grind a large part of FV, RFV or RF
The V primary component is improved (S13 to S15). In FIG. 6, the shaded portion is ground to improve the RFV or the RFV primary component. If the results of the retest and the connectivity judgment are good (S16 to S19), the tire is reversed and the force system is measured (S20, S2).
1) Finally, mark determination and mark are performed (S22 to S22).
S24).

[0003]

In the conventional uniformity testing apparatus for a tire as described above, the mechanical operation and the order of the selected measurement items are fixed.
For example, the tire measurement standard A measures the radial run-out at normal rotation, and the tire measurement standard B measures the radial run-out at reverse rotation. In this case, when the radial run-out measurement is selected in the prior art, the measurement can be performed only in the normal rotation (or only in the reverse rotation), so that the tire B (or the tire A) cannot be measured according to the measurement standard. This happens with other measurement items. As described above, when there is a request for measurement by a method not incorporated in the fixed operation, it is necessary to add a setting and change the processing content of the fixed unit or its order . The present invention has been made to solve such problems in the conventional technology, and the object is to separate the machine operation from the measurement items, thereby achieving an immediate effect.
The "measurement conditions" and "measurement items"
It is an object of the present invention to provide a tire uniformity testing device capable of coping with different measurement standards and measurement methods for different types of tires by making the order of the variables variable .

[0004]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention relates to a force generated when a tire mounted on a measurement rim is rotated based on a predetermined sequence, its fluctuation and / or geometrical force. In the tire uniformity testing device equipped with a measuring unit for measuring the variation of the dynamic shape, the measurement conditions that constitute the above sequence are rewritten with commands.
And / or change the order of the measurement items
The present invention is configured as a tire uniformity testing device including a command input unit that can be rewritten by rewriting .

[0005]

According to the present invention, when the tire mounted on the measuring rim is rotated based on a predetermined sequence, the force generated when the tire is rotated, and its variation and / or the variation of the geometrical shape are measured by the measuring unit. , Forming the contents of the above sequence
"Measurement conditions" and / Moshiku is rewritten by "order of measurement items" is input by the command input unit command. As a result, the mechanical operation and the measuring operation can be separated, so that it is possible to cope with different measuring standards and measuring methods for each tire type.

[0006]

Embodiments of the present invention will be described below with reference to the accompanying drawings to provide an understanding of the present invention. The following embodiment is an example embodying the present invention and is not intended to limit the technical scope of the present invention. FIG. 1 is a schematic diagram showing a schematic configuration of a tire uniformity test apparatus according to one embodiment of the present invention, FIG. 2 is an explanatory diagram showing a detailed structure of a measuring unit (common with the conventional example), FIG. Is an explanatory diagram showing a radial runout measurement method and a waveform example (shared with the conventional example), FIG. 4 is an explanatory diagram showing a lateral runout measurement method and a waveform example (shared with the conventional example), and FIG. 5 is a total rank and an individual rank. FIG. 6 is an explanatory diagram showing the classification method (commonly used with the conventional example), FIG. 6 is an explanatory diagram showing the grind method (commonly used with the conventional example), FIG. 7 is a flowchart of the measuring method for tire A, and FIG. FIG. As shown in FIG. 1, the uniformity testing device for a tire according to the present embodiment includes a force generated when a tire mounted on a rim for measurement is rotated based on a predetermined sequence, its fluctuation, and / or
Or, it is the same as the conventional example in that a measuring unit 1 for measuring a change in geometric shape is provided (the detailed structure of the measuring unit 1 is shown in FIG. 2).
Each measurement method is shown in FIGS. However, this embodiment is different from the conventional example in that a command input unit 2 for rewriting a command constituting the contents of the sequence is provided. In FIG. 1, the processing device A converts a command input from the command input unit 2 into a code string and transfers the code sequence to the processing device B. The processing device B is for determining the code sequence, outputting an operation command to the tester C, and performing measurement. By coding the command in this manner, the command itself can be in a format that is relatively easy for the operator to handle. The term command used here is IF,
Command words such as JUMP as well as INFLA described later
The case of indicating the operation item itself such as TE, RUNOUT
Is also included.

The method of measuring the uniformity of a tire (corresponding to a predetermined sequence) mainly comprises the following combinations of measurement conditions and operations.・ Load ・ Tire rotation ・ Tire rotation direction ・ Tire air pressure (internal pressure) ・ Radial runout measurement Yes / No ・ Lateral runout measurement Yes / No ・ Bumpy measurement Yes / No ・ Grinder ・ Mark ・ Retest ・ Classification ・ Result display This execution In the example, these measurement conditions and operations are expressed by one command or one parameter. The function and format of the command for this are exemplified below. Function and format of command for describing measurement method (1) Label: LABEL function) Specify the address to which the JUMP command, IF command and JUDGE command jump. Format) LABEL 1 (when a constant is used for a label number) LABEL A (when a variable is used for a label number) (2) Set: SET function) Set a constant to an internal variable. Or, set the contents of the internal variables to the internal variables. Format) SET variable Constant SET variable Variable

(3) Variable addition: ADD function) Adds a constant to an internal variable. Or, add the value of the internal variable to the internal variable. Format) ADD variable Constant ADD variable Variable (4) Tire air set: INFRATE function) Multiplies the tire by the air pressure indicated by the internal variable or constant. Format) INFLAT variable INFLAT constant (5) Runout device set: RUNOUT function) The runout device is set to a position indicated by an internal variable or constant. Format) RUNOUT variable RUNOUT constant (6) Measurement: TEST function) Measures and calculates specified conditions and items.

Format) TEST Warm-up time Tire rotation direction Tire rotation number Example of specified conditions and items) Load Force measurement Conicity measurement Radial run-out measurement Lateral run-out measurement Bumpy measurement Examples of measurement items related to TEST are listed below. -Warm-up time 0: None Other than 0: Warm-up time-Tire rotation direction CW: Positive number CCW: Reverse rotation-Tire rotation number 0 or more value or variable-Load 0: No load Other than 0: Load value-Force measurement OFF: Force system No measurement ON: Load, RFV, LFV, TFV, LFD are measured and the result is obtained. • Conicity measurement OFF: No conicity measurement ON: Conicity measurement ON • Radial runout measurement OFF: No radial runout measurement ON: Perform radial runout measurement • Lateral runout measurement OFF: No lateral runout measurement ON: Perform lateral runout measurement • Bumpy measurement OFF: No bumpy measurement ON: Perform bumpy measurement (7) Classification of total rank, classification of individual rank: RANK function) Individual rank judgment and total rank judgment are performed to obtain the rank and total rank of each measurement item.

Format) RANK (8) Judgment of execution of operation: JUDGE function) Execution judgment is performed for each preset operation condition, and if the judgment result matches the judgment element, the control is transferred to the designated label. . Format) JUDGE Judgment number (variable) Judgment Jump destination number (variable) Judgment number 1: Judgment execution judgment 2: Grinder execution judgment 3: Mark execution judgment 4: Retest execution judgment Judgment TRUE: True FALSE: False (9) Condition: IF function) If the specified condition is true, control is transferred to the specified label. Format) IF variable or integer Relational variable Variable or integer Destination address relational =: equal <>: not equal <: small>: large <=: small or equal> =: large or equal (10) Control movement: JUMP function ) Transfer control to the specified label. Format) JUMP Jump destination number (variable or constant) (11) Grinder: GRIND function Executes the specified grind.

Format) GRIND grind type grind type 0: grind using RFV as a threshold 1: grind using the primary component of RFV as a threshold (12) mark: MARK function) at a designated position from mark determination result Stops spindle positioning and performs marking. Format) MARK (13) Retest: RETEST function) Perform a retest. Executing this command puts the machine and each device in the initial standby state and temporarily ends the test state. Format) RETEST (14) Measurement result: RESULT function) Displays the measurement result. Format) RESULT (15) Measurement result graph display: GRAPH function) Displays the measurement result graph of the specified measurement item. Format) GRAPH 1 (16) Measurement end: END function) Measurement ends and the machine and each device are initialized.

Next , first, the tire A and then the tire B
It indicates a command example of creating a real <br/> during when performing measure of uniformity for ear. Example of command creation [Measurement of tire A] ・ Measurement standard of tire A (1) Warm-up: None (2) Load: 300 (3) Tire rotation speed: 60 (4) Force system measurement: Tire normal / reverse rotation measurement Tire pressure 2 (5) Conicity measurement: Yes (6) Radial runout measurement: Tire normal rotation measurement Tire internal pressure 2 (7) Lateral runout measurement: Tire normal rotation measurement Tire internal pressure 2 (8) Bumpy measurement: Tire normal rotation measurement Tire internal pressure 2 (9) Grinder: None (10) Mark: None (11) Retest: None (12) Measurement result: Display (13) Graph measurement result: Not displayed

The above measurement procedure (the operation sequence of the measuring apparatus and its
If the measurement item is described by a command, INF RATE 2 Set the tire internal pressure to 2 RUNOUT Set the runout device to the measurement position TEST O CW 60 300 ON ON ON ON Perform forward rotation measurement JUDGE 1 FALSE 1 Perform TEST O CCW 60 300 ON OFF OFF OFF OF F Perform reverse measurement LABEL 1 RESULT Display of measurement result END Test completed The measurement flow of tire A is shown in FIG. [Measurement of B tire] ・ Measurement standard of B tire (1) Warm-up: None (2) Load: 300 (3) Tire rotation speed: 60 (4) Force system measurement: Tire normal / reverse rotation measurement Tire pressure 2 (5) (6) Radial runout measurement: Tire normal rotation measurement Tire internal pressure 2 (7) Lateral runout measurement: Tire normal rotation measurement Tire internal pressure 2 (8) Bumpy measurement: Tire normal rotation measurement Tire internal pressure 2 (9 ) Grinder: None (10) Mark: None (11) Retest: None (12) Measurement result: Display (13) Graph measurement result: Not displayed

If the above measurement procedure is described by a command, INFRATE 2 sets the tire internal pressure to 2 RUNOUT Runout device is set to the measurement position TEST O CW 60 300 ON ON ON ON OFF Performs forward rotation measurement INFLAT 3 Tire internal pressure is set to 3 TEST O CW 60 300 OFF OFF OFF OFF OFF ON Perform bumpy measurement JUDGE 1 FALSE 1 Perform connectivity determination INFLATE 2 Set tire internal pressure to 2 TEST O CCW 60 300 ON OFF OFF OFF OFF Perform reverse measurement 1 RELABEL Display of Measurement Result END Test Completed FIG. 8 shows a measurement flow of the B tire. In Figure 7 above
Measurement procedure of tire A described and tire B described in FIG.
Comparing the measurement procedures, for example, for tire A, TE
ST → JUDGE → TEST → LABEL1
, But in the case of tire B, TES
T → INFLATE3 → JUDGE → INFLATE2
Processing is performed in the order of → TEST → LABEL1. Real truth
In the tire uniformity measuring device according to the embodiment,
As the type of tire changes in this way,
Select a command from the command input section to change the measurement conditions.
Of course, the measurement operation can be replaced or inserted.
It is configured as follows.

As described above, since the command describing the measurement method can separate the machine operation and the measurement item, it is possible to cope with different measurement standards and measurement methods for each tire type. This can be applied not only to the existing measuring methods for various tires, but also to the measuring methods that will be increasingly increased due to the development of new tires in the future. Therefore, even if there is a request for a new measurement method, there is no need to change existing software. In addition, the cycle time can be shortened by describing the minimum necessary operation for the tire measurement standard. The name of the command, the name of the parameter, and the code of the parameter are not particularly limited as long as they can be identified regardless of the above embodiment. It can also be taken as

[0016]

Since the tire uniformity test apparatus according to the present invention is configured as described above, the machine operation and the measurement items can be separated by the command describing the measurement method, and the command differs depending on the tire type. Compatible with measurement standards and methods. This can be applied not only to the existing measuring methods for various tires, but also to the measuring methods that will be increasingly increased due to the development of new tires in the future. Therefore, even if there is a request for a new measurement method, there is no need to change existing software.
In addition, the cycle time can be shortened by describing the minimum necessary operation for the tire measurement standard.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing a schematic configuration of a tire uniformity test apparatus according to one embodiment of the present invention.

FIG. 2 is an explanatory diagram showing a detailed structure of a measurement unit and the like (shared with a conventional example).

FIG. 3 is an explanatory view showing a radial run-out measurement method and a waveform example (shared with a conventional example).

FIG. 4 is an explanatory diagram showing a lateral runout measurement method and a waveform example (shared with the conventional example).

FIG. 5 is an explanatory diagram showing a classification method of a total rank and an individual rank (shared with a conventional example).

FIG. 6 is an explanatory view showing a grind method (shared with a conventional example).

FIG. 7 is a flowchart of a method for measuring an A tire.

FIG. 8 is a flowchart of a method for measuring a B tire.

FIG. 9 is a flowchart showing a test procedure of a conventional tire uniformity test device.

[Explanation of symbols]

 1: Measurement unit 2: Command input unit

──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Keishi Sumiya 2-3-1, Shinhama, Arai-machi, Takasago-shi, Hyogo Kobe Steel, Ltd. Inside Takasago Works (56) References JP-A-63-71340 (JP, A) (58) Field surveyed (Int. Cl. ⁷ , DB name) G01M 17/02 G01M 1/16 B29D 30/08

Claims (1)

(57) [Claims] 1. A tire uniform comprising a measuring unit for measuring a force generated when a tire mounted on a measurement rim is rotated based on a predetermined sequence, a variation thereof, and / or a variation of a geometric shape. In the test equipment, write the measurement conditions that constitute the contents of the above sequence
Change and / or command the order of measurement items
A tire uniformity testing device comprising a command input unit that can be rewritten by rewriting .